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Home >> Kia >> 2015 >> Optima Hybrid >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Active Hydraulic Boost (AHB) System - Optima HEV >> Brake Actuation Unit >> Repair Procedures >> Removal

Repair Procedures: Removal

  1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  2. Remove the air duct (A).
    Fig 1: Air Duct
    G08312309Courtesy of KIA MOTORS AMERICA, INC.
  3. Remove air cleaner assembly (B).
    Fig 2: Air Cleaner Assembly
    G00548730Courtesy of KIA MOTORS AMERICA, INC.
  4. Disconnect the brake fluid level switch connector (A), and remove the reservoir cap.
    Fig 3: Brake Fluid Level Switch Connector
    G00548731Courtesy of KIA MOTORS AMERICA, INC.
    NOTE: Be sure to completely remove foreign substances from around brake fluid reservoir and cap before opening the reservoir cap. If not, it may cause contamination of brake fluid and deterioration in braking performance.
  5. Remove the brake fluid from the reservoir with a syringe.
    NOTE:
    • Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.
    • To prevent any dust entering in the reservoir, the reservoir cap should be closed again after removing brake fluid.
  6. Disconnect reservoir hose from the reservoir and IBAU connector (A).
    Fig 4: IBAU Connector
    G00548732Courtesy of KIA MOTORS AMERICA, INC.
  7. Disconnect the brake tube from the IBAU by loosening the tube flare nut (B).
    CAUTION: The following information describes how to diagnose faults using a diagnostic instrument.
    1. Connect the diagnostic instrument to the self-diagnostic connector (16-pin) beneath the crash pad on the side of driver"s seat, and then turn on the ignition to activate the diagnostic instrument
    2. In the GDS Vehicle Type Selection menu, select "Vehicle Type" and "Brake/VDC/AHB" System
      Fig 5: High Pressure Release Mode Selection
      G00569775Courtesy of KIA MOTORS AMERICA, INC.
      Fig 6: High Pressure Release Mode Procedure 1
      G00569776Courtesy of KIA MOTORS AMERICA, INC.
      Fig 7: High Pressure Release Mode Procedure 2
      G00569777Courtesy of KIA MOTORS AMERICA, INC.
      Fig 8: High Pressure Release Mode Procedure 3
      G00569778Courtesy of KIA MOTORS AMERICA, INC.
    3. Disconnect the negative (-) battery terminal.

    Tightening torque: 

    13.7 ~ 16.7 N.m (1.4 ~ 1.7 kgf.m, 10.1 ~ 12.3 lb-ft)

    Fig 9: Flare Nuts
    G00548733Courtesy of KIA MOTORS AMERICA, INC.
  8. Remove the brake pedal assembly. (Refer to BRAKE PEDAL )
  9. Remove the IBAU mounting nuts (A) and then remove the IBAU.

    Tightening torque: 

    12.7 ~ 15.7 N.m (1.3 ~ 1.6 kgf.m, 9.4 ~ 11.6 lb-ft)

    Fig 10: IBAU Mounting Nuts
    G00548734Courtesy of KIA MOTORS AMERICA, INC.
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